Panarctic Flora


160101 Calla palustris L.


Western Alaska: Rare
Northern Alaska - Yukon: Rare
Central Canada: Rare
Shrub Tundra: Rare
Bordering boreal or alpine areas: Frequent

2n= (1) 36 (4x). - Europe, Siberia, Far East (N), Canada, U.S.A. - Numerous reports, partly for C. brevis.
(2) 60-70. - Europe (N). - At least two reports with four or more counts (2n = 60, 63, 69, 70).
(3) 72 (8x). - Europe, Russia. - Numerous reports.

Geography: Circumboreal: ALA CAN.

Notes: Löve and Löve (1975a) assigned the North American and Siberian plants to the presumed tetraploid Calla brevis which they considered to be specifically different from the European presumed octoploid C. palustris s. str. North American plants are known as tetraploids, whereas tetraploids, octoploids, and plants at intermediate ploidy levels occur in Europe. Thompson (2000) accepted only C. palustris for North America and did not mention the fairly often applied North American name C. brevis. For a fairly old study of Calla, see Dudley (1937). A modern comparison of North American and Eurasian plants is needed. Provisionally, we accept only one species.

Higher Taxa